Brig. Gen. Mark A. Kyle, right, accepts the 4th Air Force guidon from Lt. Gen. Charles E. Stenner Jr., chief of Air Force Reserve, Headquarters U.S. Air Force, Washington, D.C., and commander of Air Force Reserve Command, Robins Air Force Base, Ga., during a change-of-command ceremony at March Air Reserve Base, Calif., March 12, 2011. General Kyle is the new commander of 4th Air Force, replacing Maj. Gen. Eric W. Crabtree. (U.S. Air Force photo/Master Sgt. Linda Welz)